The Pvc helps vent the block and it will/should stop the oil from comming out of your breather.Also one other thing If there is no baffle under that oil breather you may still have oil comming out of it.Just because of oil splashing the bottom of it.
Just my 2cents.
X2,
I cant believe Tlowe allowed his lumps let alone his adaptor to be installed into a 194 head.

J.K.= Just kidding.
MBHD
Thanks guys. The Tom I was referring with the adaptor is Langdon (bought a long time ago) and the lumps are from Larry.
I realize a PCV valve set up would help but trying not to go there if I don't have to. Guess I could cut them in (4" versions)and in the event I have oil coming out those breathers then go with a PCV setup.